Centrifugal fan and method of making the same



Sept. 25,1923. 1,469,085

a N. H. HENDERSON CENTRIFUGAL FAN AND METHOD MAKING THE SAME Filed July 15 1921 fig. 1.

IN VEN TOR.

ATTORNEYS,

Nansen n. EENDEESOROF sYR-ee sE; new YORK."

Patented Sept. 25 1923. 7 I i oENTnIrtieAL-rAN a m r-vinriron DEMAKINGTi-lESBl-ME I Application flied iui 15, i921. s iain eesuea I To allwiwm t'may cancer 1 v r Be it known that IgNELson- HpElENDER son, a citizen of the'United States, and'a resident of Syracuse, in the county of Onondaga and State of New York, haveinvented a certain new, and-useful Centrifugal i highly efiicient and durable in useyand the F an and Method offllvlakingthe' Same; of which the following is aspecificat on.

This inventionhas for its object a centrifl ugal fan which is part cularly simple 1n.

construction, economical in manufacture and method voi producing the same. v H I The invention consists in the novelfea? tures, and in the method hereinafter set forth and claimed. g r v in describing this invention. reference had to the accompanying drawings in which like characters designate corresponding parts in all the views, 1 I V w Figure 1 is aface View of a "fan embodying my invention.

Figure 2 is a cross sectional view taken centrallyon Fig.1. r

This fan comprises generally, a I body discoidal in general form and formed with oblong slots incl-ined outwardly crosswiseof radii of the body and terminating short'of the edge of the body andbla desor inner blade sectionsintegral with the body and formed from the portions displaced to formi tlie slots, the blades being arrangedaedgewise relatively to the body and out ofahnement with the slots, andeach being joined to the body at the inner ends of one of the long sides of one of the slots,'each slot separating the blades along one long side of the blade, the two ends, and part way along the other long side from the outer end toward the inner end of the long side, these blades diverging out of line with the slots from the juncture of said blades with the body. The body is also provided with outwardly extending integral prongs arranged edgewise relatively to the'body, the inner ends ofthe prongs being secured to the outer ends of said blades. The prongs constitute outer blade sections. l i

The method consists in forming a-discoidal body 1 with outwardly extending prongsQ, slitting the body at 3 in line with one long edge of the prongs at t and across the inner ends of the prong,,bending the prongs 2 into a position e lgewise-relatively to one face of the body 1, slittingthe body to outline a seriesoi' slots '5cinc lined"rela, l I ytively tolradn of the body rand extending crosswise of the rad-.11 of thenprongs g l f slits separating each portion or'jflap" en closed thereby along the ends, one long side and'pa-rt way alongthe other lo n side or" said i portions or. flaps from the outer-endsthereof toward the inner ends, displacing said" flaps and t-lIeI'QbYjQI'OVlCllIlgQ13 slots 5 are ranging said portions 011 flaps 6" edgewise,

relatively to the body, bending-thefree ends' of said portions or ,fiapst-bwaidthle radial prongs 2 about the 'junctui'eslli connecting said portions or gflaps} with the, body and thereby forming blade sections and connect-' mg the outer ends of said blades' dftothei lll ner ends ofthe prongs 2. a I. I a The prongs when bent edgewise relatively to the body'constitute outerblade sections and'the portions or flaps 5 constitute inner blade sections, the inner ends of the blades along the junctures 7 extend inthe direc tioniof rotation ofthe fan and form-scoops on, the intake sideof the fan. As the'slots J 5 terminate short oft-he {edgeyof the body bracingstrips 9 are provided-between the blades. ,That is the bodyv isnotdividedby the slots. Also, owing to the arrangement oi the slots curved'blades having scoops at. j"

their inner ends are provided.

tional blades IO-between thel blades 2. A

su table hub is attached by welding or other wise to thebody 1. I Y

This. fan is particularly advantageous-in that it is stamped entirely troin' sheet nietalj and the inner blade sections are curved rela tivelyto the outer blade section, although formed from straight slots formed in the bodyofthe fan. a v lVhat I claim is: t c :1. A sheet metal fan having a discoidal bodyforniedwith oblong slots inclined-relatively to radii of; the body andterinin'ating short or" the periphery of the body and integral blades arranged edgewise rela tively to the body and out of alinenient with" the-slots; said blades being formed by the portions displaced to torni the slots, the slots separating theblades froin'the body along the ends one long side and partway along the other long side frorntheoute'r end of lad'es'towa'rd their inner ends, subsuch stantlally as and for-the purpose described. x2. A sheet metal fan'havin'g a dlscoidal ihe body 1 is also providedwith tively to'radii of the body and terminating Qshort. of the periphery of the body, and-inteoo id'al in general ilOlPll and .y.ardly extending outer biade" sections a1- 1; ranged edgewise relati y body and ezitending'beyond the periphery ofj 'gi'al'blades arranged edgewise reiatively' to the body and out of alinel'nent with the slots," 1 V sa-idblades being formed by the portions d1s= plaicedfto form the ,slots, the slots. separating theblades enclosed by'the walls thereof from' the'body'along theiends, one long side and outer end of such end, theirj onter portions. extending in radlal g g p U "tively to radii of the'b'ody, separating each" part wayalongjthe other long side} fron jthe' portion toward the inner lines toward the juncture o iisaid blades with the body a'nd thereby providing blades r enrved at their inner ends and radially at theironterends, substantially as and for the. purpose specified. 1'

"1g a bodyfdislormcd with out- A sheet metal fan-ha to one side of the the body, zind'inner blade sections'secnred to the body and arranged eogewlse relatively to said side and secured at their outer ends to i the inner ends of the outer bladei seetions,

'snbstantially as and for .the purpose set forth; t 4. A sheetnietal fan haying a bodydiseoidal in general outline and formed with radially extending outer blade sections ar -V ranged edgewise relativ ely tothe plane'of [one side of the-body and extending beyond l the perlphery of the body, and inner-blade $5 7 I sections seeured to the bodyatrtheir inner, ends out OfTELClIStl alinenient withxthe outer blade sections and having their outer 'end portions arranged in alinenient with the out- '1 ,er blade sections andsecnred thereto, sub

s tantia'lly asandjor the 'piirposedesoribed, 5, A sheet inetal fan hav ng a body dlsf coidal in general outline formed with outwardly extending outer blade sections ar ranged edgewise relatively to the body and with oblongslots extending crosswise 01 lines entendingrlengthwise ofthe onter blade sectlons, and nner biaee sections formed from the portions displaced to form theslots,

the slots separating the inner'blade sections along the end walls, one sidewall and part way along the other long sidewalls from the outer ends of the slots toward the lnner ends, sa'id blades being arranged edgewise relatively to the body and out of alinement diseases: 7 1 ,lir' lf with the slots froni'the 'junctures of the in ner ends of saidlnner bladesectlons with the body at the inner end of onelong side of the s he outer blade sections whereby the inner their inner ends, substantiallyns and for the purposespecified; i a ,1 t

The method OfffOlilllng centrifugal fan consisting in slitting discoidal blank to ontline a series of oblongslots inclined relaportion enclosed thereby from "the, body along the fotherlong, sidefroni the enter said po tions out of theslotsa d arranging them edgewise relativelyfto the body; and

bending the free ends of said'portions toward radial lines of the body-1 substantially at" the juncture of said portions Jwith'the along the ends, one jlongside'and partway zo 7 end tliereot'towardithe nineriend, displacing body and thereby providing curvled blades, 7

substantially as and for-the purpose iset L01 f1." 7- j -'Z'. The method of forming. a centrifugal tan consisting in fornnng 'd seoidal blank having outwardly extending prongs,"-slitting the edge of the blank in line with one long side ofeach prong and acrosstne inner end as to "the blank,"

of each prong, bendingthe; position edgewise relatively slitting the blank to outline long slots inclined relatively body extending lengthwise of the prongs, these slits sepaiating'ea'chportion enclosed thereby from the bodyalong the ends, one

prongs into a a series lot obto radii of the long side'andpartwayalong the other long side from the outer end thereof toward the inner end, displacing said portions out'of the slots and arranglng theinfedgewlse relativeportion's toward rthe radial lines of the prongs about the ]unctnres ofsa1d portions with the body and securing the onter'ends NELSON n nnnnnnso r" New York,'tliis V 95' V .ly to the body, bending thefreeends of'said 

